The recommended Metric Oil Pressure Adapter suggested by @ littleblazer is made by Accel Auto-Meter Competition Instruments Part# 2268 and will require a careful pre-fitting with the Analog Oil Pressure Gauge Kits that have the better Copper Pressure Fitting Non-Flare design rather than using the ones with the Opaque Nylon Oil Line.
I realize that it is tiresome to imagine the Motor Mounts as being Right at The Top of The Circus of Central Casting as the cause and origin of the repeated Flex Plate failures… but if you do decde to change them out along with a brand new Transmission Mount… the best choice will be the GM OEM Part # 15062381 … and could cost a pretty penny, too at around $85.00 a piece.
Also... Your Proof of Flex-Plate Failure images show just how much Motor Oil has been leaking out of the Rear Engine PTFE Seal... and the need to hand polish away the offending Crank Journal rough spots for the replacement needed. The oil drops collecting on the Fasteners should encourage you that you do not have any Oil Consumption Problems from Burning or mis-direction into the Air Chamber via the PCV Hose...and that is all Good News.
As far as the method you have been using to tighten down the Torque Converter Bolts... instead of going through the Starter Motor Cavity to do this... Pull the Black Plastic Plug located in the underside rear of the Crankcase Oil Pan Flange...rotate the Flex-Plate by Hand to align the Three 120 Degree separated Torque Converter Bolt Holes with that unplugged opening...and afterwards, insert a 15 MM Deep Socket through that opening and with just a Dab of Loc-Tight on their threads, tighten them ALL down evenly first... then continue rotating the Flex-Plate and use a Torque Wrench to finish them off. The Mild Steel of the Flex Plate is easily crushed and distorted into ovals by trying to use Too Much Torque on those Ultra Hard 10.9 (Grade 8) Short Bolts. You can also use an H-10 Hex Socket if the OEM cleaned up TC Bolts are still in there... or stick with the 15MM Deep Socket as they will both work on the same Factory Bolts. It goes without saying that this is a laborious PITA as you well know... but this amount of attention to these details might pay off and solve the issue.
I realize that it is tiresome to imagine the Motor Mounts as being Right at The Top of The Circus of Central Casting as the cause and origin of the repeated Flex Plate failures… but if you do decde to change them out along with a brand new Transmission Mount… the best choice will be the GM OEM Part # 15062381 … and could cost a pretty penny, too at around $85.00 a piece.
Also... Your Proof of Flex-Plate Failure images show just how much Motor Oil has been leaking out of the Rear Engine PTFE Seal... and the need to hand polish away the offending Crank Journal rough spots for the replacement needed. The oil drops collecting on the Fasteners should encourage you that you do not have any Oil Consumption Problems from Burning or mis-direction into the Air Chamber via the PCV Hose...and that is all Good News.
As far as the method you have been using to tighten down the Torque Converter Bolts... instead of going through the Starter Motor Cavity to do this... Pull the Black Plastic Plug located in the underside rear of the Crankcase Oil Pan Flange...rotate the Flex-Plate by Hand to align the Three 120 Degree separated Torque Converter Bolt Holes with that unplugged opening...and afterwards, insert a 15 MM Deep Socket through that opening and with just a Dab of Loc-Tight on their threads, tighten them ALL down evenly first... then continue rotating the Flex-Plate and use a Torque Wrench to finish them off. The Mild Steel of the Flex Plate is easily crushed and distorted into ovals by trying to use Too Much Torque on those Ultra Hard 10.9 (Grade 8) Short Bolts. You can also use an H-10 Hex Socket if the OEM cleaned up TC Bolts are still in there... or stick with the 15MM Deep Socket as they will both work on the same Factory Bolts. It goes without saying that this is a laborious PITA as you well know... but this amount of attention to these details might pay off and solve the issue.
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